At start of reaction the concentration of reactants is_______________?
(A) high
(B) low
(C) according to Kc
(D) constant
Chemical equilibrium state is_______________?
(A) dynamic state
(B) static state
(C) free state
(D) unidirectional state
Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?
(A) 0.0002M HCI
(B) 0.2 mole of NaCI with 0.2 mole of HNO3
(C) 0.4 mole of CH3COOH with 0.4 mole of NaOH
(D) 0.4 mole of NH3 with 0.2 mole of HCI
In which of the following equilibria will Kc and Kp have the same value ?
(A) PCI5 = PCI3 + Cl2
(B) N2 + 3H2 = 2NH
(C) 2CO + O2 = CO2
(D) N2 + O2 = 2NO
In the purification of portable water the coagulant used is_________________?
(A) alum
(B) nickel sulphate
(C) copper sulphate
(D) barium sulphate
Which statement is wrong ?
(A) the amount of ozone layer is greater in the region close to the equator
(B) ozone acts as filter for UV radiations
(C) in the equatorial region it acts as pollutant
(D) CFCs play effective role in removing O3 in the stratosphere
Which of the following air pollutants is more dangerous for ozone layer ?
(A) CFC
(B) CO2
(C) CO
(D) Oxides of nitrogen
In which of the following layer of atmosphere there is more thickness of ozone layer ?
(A) troposphere
(B) stratosphere
(C) mesosphere
(D) photosphere